Bone Resection Jig Used in Artificial Knee Joint Replacement Surgery

Abstract

A bone resection jig that can make ligament tension equal at extension and flexion positions without any actual measurements when resecting femur and tibia during artificial knee joint replacement surgery. The bone resection jig used in artificial knee joint replacement surgery includes a spacer block (1) comprised of a grip (6), a hollow box (7) that is provided on an other end side of the grip and has a vertical hole (7a) therein, and a reference spacer part (8) that extends out from the hollow box (7) and is adapted be inserted into the resection region between femur and tibia; a reference pin guide (2) which, when the femur and tibia are in the flexion position, is inserted into the vertical hole (7a) of the hollow box, extends on the reference spacer part (8) to the other end side of the grip so as to come into contact with a resection plane (FH) of the tip of the distal end of the femur, and is formed with guide holes (9) for guiding reference pins (3) to be installed from a front side into the resection plane (FH) of the tip of the distal end of the femur; and an aiming member (12) which is, after the spacer block (1) has been removed from a space between the femur and tibia leaving the reference pins (3), brought onto the reference pins (3) by being guided thereby, the aiming member being provided with an indicator (14) that indicates a resection plane (FR) at a back of the distal end of the femur when the aiming member (12) comes into contact with the resection plane (FH) of the tip of the distal end of the femur.

Description

TECHNICAL FIELD[0001]The present invention relates to a bone resection jig used during artificial knee joint replacement surgery.BACKGROUND ART[0002]When a knee joint suffers knee osteoarthritis, rheumatoid arthritis, or bone tumors, or suffers external injury or the like, the part subject to joint damage at the tips of the femur and tibia is resected, and those parts are replaced with an artificial joint. This artificial knee joint, as conventionally seen, comprises a combination of a femur component, which has two condyles of medial and lateral, and a tibia component, which has a joint plate that bears these two condyles and allows them to rotate; and it is desirous that artificial knee joints that are comprised of such condyles and joint plates preferably be movable similarly to a biogenic knee joint.[0003]The femur and tibia are connected by numerous ligaments, and extension and flexion of them are made by tensioning and relaxing these ligaments. It is particularly desirable tha...

AI Technical Summary

Benefits of technology

The present invention is a bone resection jig that has a simple constitution with very few parts. It includes a spacer block, a reference pin guide, and an aiming member. The jig is lightweight, inexpensive, and easy to operate. It ensures accurate positioning and resection of the bone with minimal damage to the surrounding tissues. Additionally, it allows for flexion of the knee joint to a maximum of 90 degrees while maintaining the proper alignment of the bone fragments. The jig is designed to block the field of view only when the spacer block is inserted, and it can be set accurately in the right attitude. The back of the distal end of the femur can be set to resection planes of various levels and angles, and the femur can be placed in flexion of up to 90 degrees while maintaining the proper alignment of the bone fragments.

Problems solved by technology

However, the invention of this prior art checks (measures) the tension of ligaments in both extension and flexion positions; accordingly, the operation is troublesome, and it requires a longer surgical time.

Further, the constitution is complex, and it includes many moving parts and adjustment parts, and further it requires numerous operation steps that are difficult and require proficiency.

In addition, it is heavy and expensive.

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